code: def get_patch(self, obs_index, pos_h, pos_w, *, expand_mult=1):
      left_h = self.pad_h + (pos_h - 0.5 * expand_mult) * self.patch_h
      right_h = self.pad_h + (pos_h + 0.5 * expand_mult) * self.patch_h
      left_w = self.pad_w + (pos_w - 0.5 * expand_mult) * self.patch_w
      right_w = self.pad_w + (pos_w + 0.5 * expand_mult) * self.patch_w
      slice_h = slice(int(round(left_h)), int(round(right_h)))
      slice_w = slice(int(round(left_w)), int(round(right_w)))
      return self.padded_obses[obs_index, slice_h, slice_w]
  
file_path: lucid/lucid/scratch/rl_util/nmf.py
imports: import numpy
  from functools import reduce
  import scipy.ndimage
  from lucid.misc.channel_reducer import ChannelReducer
  import lucid.optvis.param
  import lucid.optvis.objectives
  import lucid.optvis.render
  import lucid.optvis.transform
  from .attribution import get_acts, get_attr
label_desc: Use image node_id 4 for calling the LayerNMF obj's underlying member method code with example usage: obj.get_patch(obs_index, pos_h, pos_w) and returns: self